/Engine/Source/Runtime/Engine/Classes/EditorFramework/AssetImportData.h
Resolve a filename that is relative to either the specified package, BaseDir() or absolute
static [FString](API\Runtime\Core\Containers\FString) ResolveImportFilename ( const [FString](API\Runtime\Core\Containers\FString) & InRelativePath, const [UPackage](API\Runtime\CoreUObject\UObject\UPackage) * Outermost )